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Hello, i have tried getting my rear window defrosted early in the morning but its not working. I press the button to turn it on but the light next to the button doesnt come on nor does it defrost window

There is also a rear defogger relay in the rear power distribution box located under the rear seat cushion. You don't tell us what year your car is. This is important because the relay location in the 89 and 90 models are a little different than the 91 and later models.

If you have the Bentley manual, take a look at page 610-2 for details.

Thank you so much. I will take a look at that page. Im very ignorant on finding my way around this book. Roxy

Page 610-2 shows where the relay location is, but not the fuse location. The fuse location is on page 610-1. The fuse is located in the front power distribution box which is on the driver's side behind the strut tower.

is this also happening in conjunction with the AC not working? check to make sure. if the AC is also not working as well or that light there by the AC or the Recirc button are blinking or lighting up orange instead of green, then most likely not the fuses and instead it is the IHKR, which is your climate control module and which is the "brain" that controls the rear defrost, AC and recirc buttons and it can get a little corroded and sometimes just needs to be cleaned.

I had this problem a little while ago. It was the IHKR.

(I have a '94 530i which might have a different climate control module than your car. You might have the "sword" as a climate control module which looks more like this one on eBay here that came from a '94:

There seems to be significant variation within models on this. whether it is called an "IHKR" or "climate control module", or the "sword" can be different between years and the ease of pulling it out from behind the controls in the dash can also vary widely I learned when I had this problem. But it turned out I didn't need a new one but that I just needed to clean the corrosion on my existing one with a toothbrush. Bentley's will tell you which you have and how to remove it. I found some replacements for about $75 for the particular IHKR my car has but I didn't need to purchase one.

Could also be the #28 fuse in the front box or the relay by the fusebox under the back seat, as previously mentioned but that would just be too easy